"those outstanding apostles Andronicus and Junias" (Rom 16:7, Jerusalem Bible)
"Junias...outstanding among the apostles" (NIV)
"Junias...eminent among the apostles" (NEB)
(I am not an Egalitarian!)
I'm of the opinion that Junia was both a woman and an apostle. After having done some work on the nature of apostolicity in the early church, it does seem likely that a number of women held the office of apostle in the first generation of believers. (I don't believe the office of apostle continued after the first generation, or two, of the Church.)
As for the question about textual variants supporting this conclusion, I would point to Robert Jewett's
Romans commentary which makes this point:
Some of the variants in these final chapters of Romans downplay the important role of women in leading early congregations. The role of Phoebe is diminished by the deletion of “and” in 16:1*; by the reversal of “receive her” in 16:2*; by eliminating the pronoun “she” in 16:2*; and by the change from “patron” to “helper” in 16:2*. In 16:3* several variants provide the diminutive form “Priscilla” in place of the polite, formal name, Prisca. Some medieval and modern scholars changed the feminine name of Junia to the masculine Junias in 16:7* to eliminate the impression that a woman was “outstanding among the apostles.”81 Some variants in 16:7* downplay the impression that Andronicus and Junia were converted before Paul. These variants fit the anti-feminine bias that text critics have discovered elsewhere. Robert Jewett and Roy David Kotansky, Romans: A Commentary, ed. Eldon Jay Epp, Hermeneia—a Critical and Historical Commentary on the Bible (Minneapolis, MN: Fortress Press, 2006), 17.
There are some textual variants that show both Junia and Phoebe were changed from female nouns to masculine ones. This is easily attributed to someone(s) trying to change the Bible to match their theology.
Honestly, I don't have a problem with female apostles. The office doesn't appear to have wide ranging authority over multiple churches or that there was even a high council of apostles dictating how the early Christian communities would form. Apostles served, as a principal purpose, as the initial missionaries for the expansion of the Church. As eye witnesses to Jesus' life and ministry, a noted qualification from Acts 1, they would carry the heart of the Gospel with them and had powerful testimonies to speak as they spread the Good News to the ends of the Earth, as they best understood it.